hi , i've been lurking the forum for a few days now.
i was planning to make a combustion rifle . but i don't know
how am i going to make a chamber. since the barrel would be much smaller in diameter if im not mistaken the pressure inside chamber is going to be much higher than in those of cannons. so i don't thrust pressure rated pvc much. i was thinking would 1kg fire extinguisher chamber be sufficient at
those pressures . but if i take fire extinguisher i don't know how am i going to put a fan inside. so does anyone have a solution. maybe pressure rated pvc would be enough...

oh . so speaking about power , pneumatic would be more powerful ?
i would take some marbles with me to test fit them in pipe anyway . thanks for warning anyway. i was planing on putting a ball valve at the back and inject butane with that plastic thing people get shots with, ( i do not know what is that called in english) so i think that would make a more powerful mix.
what would you say maximum possible pressure would be then ?
taking in consideration exit pipe diameter .

i would prefer a combustion. if you say pressure rated pvc is fine i believe you and think it is going to be fine.
i don't agree on simplicity. combustion is simpler if you ask me.
where would i get an electronic sprinkler valve in croatia ?
nowhere . and if i find it it would be around $100.
for a combustion i only have to make a chamber , and mount a piezoelectric
sparker and a fan. mount barrel to one end and ball valve on other.

in this case i would prefer for this rifle to look nice. i don't plan on making something deadly but it would be nice to shoot as good as it would look.
so maybe ill make a wooden stock .

As others have stated you'll be fine with pressure rated PVC. If you want power and consistency, meter your fuel well. Not sure what sort of plastic electrical conduit you have in Croatia but if it's of the 20mm OD type, ID is usually around 16.5mm for an ideal barrel.

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hectmarr wrote:You have to make many weapons, because this field is long and short life